US2217865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydrogenation catalyst
Assignee: Shell Development Co
•
Filing: 1939-07-04
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Granted: 1940-10-15
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Expires: 1959-07-04
Abstract
No abstract record available.
Inventors
- 👤 Herbert P A Groll
- 👤 Burgin James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:45
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/002; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3332; C07C5/367; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-10-15 | 1944-04-15 | 1944-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-15 | 1948-04-15 | 1948-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-15 | 1952-04-15 | 1952-10-15 | $7700.00 | Window Closed / Lapsed |